CN117781089A - Vacuum heat insulation pipe structure and manufacturing method thereof - Google Patents
Vacuum heat insulation pipe structure and manufacturing method thereof Download PDFInfo
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- CN117781089A CN117781089A CN202311630281.4A CN202311630281A CN117781089A CN 117781089 A CN117781089 A CN 117781089A CN 202311630281 A CN202311630281 A CN 202311630281A CN 117781089 A CN117781089 A CN 117781089A
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- 238000009413 insulation Methods 0.000 title claims abstract description 95
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000005452 bending Methods 0.000 claims abstract description 54
- 238000009423 ventilation Methods 0.000 claims abstract description 13
- 238000003466 welding Methods 0.000 claims description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 239000004576 sand Substances 0.000 claims description 30
- 239000011229 interlayer Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 238000011049 filling Methods 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 9
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 2
- 238000007514 turning Methods 0.000 claims description 2
- 239000011265 semifinished product Substances 0.000 claims 3
- 238000010276 construction Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 239000003380 propellant Substances 0.000 description 9
- 238000005187 foaming Methods 0.000 description 6
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- 239000004814 polyurethane Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a vacuum heat insulation pipe structure and a manufacturing method thereof. The vacuum heat insulation pipe structure has the characteristics of slender structure and applicability to complex space, and comprises an inner guide pipe, an outer sleeve, a heat insulation support, a jacket flange structure and an outer sleeve connecting piece; the outer sleeve is sleeved outside the inner catheter, the outer sleeve and the inner catheter are provided with one or more bending parts, and an adiabatic support is arranged between the outer sleeve and the inner catheter at the bending parts; the end part of the outer sleeve is connected with the jacket flange structure through the outer sleeve connecting piece, and the outer sleeve and/or the jacket flange structure is provided with a vacuum ventilation port. The pipe heat insulation pipe structure has small overall thickness and can achieve an elongated shape. Due to the small size specification, the rail attitude control power system can be completely suitable for the compact general assembly layout of the rail attitude control power system. The heat insulation pipe can be bent at any angle and space according to the requirements of system layout, and the effect that the vacuum heat insulation pipe structure can be bent according to the space trend is achieved.
Description
Technical Field
The invention relates to the technical field of low-temperature propulsion systems, in particular to a long and thin heat-insulating pipeline for conveying low-temperature propellant of a propulsion system and a manufacturing method thereof, in particular to a long and thin vacuum heat-insulating pipe with a complex space trend and a manufacturing method thereof, and particularly relates to a vacuum heat-insulating pipe structure and a manufacturing method thereof.
Background
With the development of liquid rocket technology, a low-temperature propulsion technology using liquid oxygen, liquid hydrogen and liquid oxygen methane as working media will be an important direction of future development. The cryogenic propulsion system needs to have good thermal control means to ensure delivery of the cryogenic propellant and to place vaporization of the cryogenic propellant. In particular, for a low-temperature rail attitude control power system, the system precooling is started on the ground. The requirement of the engine inlet temperature during ignition of the engine is ensured, a large number of slender pipelines exist in the track attitude control power system, huge heat leakage can be generated to the system, pre-cooling loss of the propellant is increased, and even reliable ignition of the engine can be influenced. The traditional low-temperature system generally adopts a passive stacking heat insulation scheme of polyurethane/aerogel thermal control coating, and adopts polyurethane foaming coating aiming at low-temperature storage tanks, long propellant conveying pipelines and the like without disassembling and replacing components, but the thickness of coating materials is thicker aiming at an elongated pipeline for a rail attitude control power system, and the system is difficult to implement. And the curvature radius of the pipeline is small, the trend of the pipeline is often in a three-dimensional irregular form, the polyurethane foaming of the slender pipeline needs to be molded each time, and a certain risk exists in the process. The thermal insulation performance will be greatly reduced after the reusable rocket will undergo multiple low temperature environmental moisture absorption/condensation/icing. At present, mature vacuum heat insulation pipes exist in the market, but most of the vacuum heat insulation pipes are aimed at large-specification pipeline systems, have huge size, numerous welding lines and complex manufacturing procedures, and cannot be directly applied to low-temperature rail attitude control power systems. Therefore, a new pipeline thermal control means is needed to be adopted for the low-temperature rail attitude control power system, and a passive thermal control design is carried out on the system.
Disclosure of Invention
In view of the drawbacks of the prior art, an object of the present invention is to provide a vacuum insulated pipe structure and a method of manufacturing the same.
The invention provides a vacuum heat insulation pipe structure, which comprises an inner guide pipe, an outer sleeve, a heat insulation support, a jacket flange structure and an outer sleeve connecting piece, wherein the outer sleeve is connected with the inner guide pipe;
the outer sleeve is sleeved outside the inner guide pipe, the outer sleeve and the inner guide pipe are provided with one or more bending parts, and an adiabatic support is arranged between the outer sleeve and the inner guide pipe at the bending parts;
the end part of the outer sleeve is connected with the jacket flange structure through the outer sleeve connecting piece, and the end part of the inner conduit is connected with the jacket flange structure; the outer sleeve and/or the jacket flange structure is provided with a vacuum ventilation port.
Preferably, the vacuum insulated pipe structure is an elongated insulated pipe, the length and the outer diameter of the vacuum insulated pipe structure are in a ratio of less than 1:40;
the outer sleeve is a metal straight pipe before manufacturing and processing, the inner surface of the outer sleeve is bright, and the inner diameter of the outer sleeve is 1-3 mm greater than the outer diameter of the inner guide pipe.
Preferably, the jacket flange structure comprises a jacket flange body and a jacket flange lining, the jacket flange lining is sleeved in the jacket flange body, the jacket flange lining is directly connected with the inner conduit, and the jacket flange body is connected with the outer sleeve through the outer sleeve connecting piece;
the outer sleeve and/or the jacket flange body are provided with vacuum ventilation ports;
the contact part of the flange lining and the flange body is used for reducing metal heat conduction, and the design thickness is within 1 mm;
the end face of the jacket flange body is provided with a sealing face or a sealing groove for connecting and sealing between pipelines, and a concave structure is designed in the middle of the end face of the jacket flange body 4 for installing the jacket flange lining.
Preferably, the number of the heat insulation supports is determined according to a bending angle of the bending part;
the bending angle of the bending part is within 90 DEG, and the number of the heat insulation supports is 2;
the bending angle of the bending part is more than 90 degrees and less than 180 degrees, and the number of the heat insulation supports is 3.
Preferably, the material of the insulating support is selected to have a higher hardness and a lower thermal conductivity; the thickness of the heat insulation support is within 3 mm;
the heat insulation support is a circular ring structure provided with cutting parts, and the cutting parts 31 are arranged along the circumferential direction of the circular ring structure; the cutting part is used for reducing the contact surface area of the heat insulation support and the outer sleeve so as to reduce heat transfer, and is also used for making the vacuum heat insulation pipe structure, and sand grains can normally enter and exit the jacket structure in the sand filling and pouring step.
Preferably, the outer sleeve connecting piece is of an annular structure and is made of stainless steel.
The manufacturing method of the vacuum heat-insulating pipe structure provided by the invention is used for manufacturing the vacuum heat-insulating pipe structure and comprises the following steps of:
s1, measuring the size;
s2, sand filling of a jacket;
s3, bending the heat insulation pipe;
s4, jacket sand removal;
s5, bending and checking;
s6, welding a jacket flange;
s7, welding the flange and the heat insulation pipe;
s8, evacuating and sealing the interlayer.
Preferably, the step S1 includes: bending a sample rod according to actual requirements, measuring the length of the sample rod, selecting a metal straight pipe with corresponding specification, cleaning and drying the metal straight pipe to serve as an inner guide pipe and an outer sleeve, measuring the length of the inner guide pipe according to the length of the sample rod, subtracting 2-5 mm from each of two ends of the length of the inner guide pipe, measuring bending or bending positions of the sample rod by using a measuring rope, determining the number and positions of heat insulation supports according to bending or bending angles, marking the corresponding positions of the inner guide pipe and the outer sleeve support by using a marking pen, sleeving the heat insulation supports into the inner guide pipe, fixing the heat insulation supports by using glue, plugging the inner guide pipe with the heat insulation supports into the outer sleeve after the glue is solidified, and reserving 2-5 mm from each of two ends of the inner guide pipe to form a semi-finished heat insulation pipe, wherein the semi-finished heat insulation pipe is of a jacket structure.
The step S2 comprises the following steps: fixing a blanking cover tool at one end of a semi-finished heat-insulating pipe, erecting the semi-finished heat-insulating pipe, and filling sand into an interlayer between an inner guide pipe and an outer sleeve; and after sand filling, a plugging tool is plugged into the other side of the semi-finished thermal insulation pipe to plug the semi-finished thermal insulation pipe, the clamping tool is used for clamping the plugging tool, and the plugging tool is used for plugging the semi-finished thermal insulation pipe.
The step S3 includes: the semi-finished thermal insulation piping is placed on a bending die at a desired position and bent to a desired angle in accordance with the desired bent sample bar.
Preferably, the step S4 includes: after the semi-finished heat-insulating pipe is bent, a blanking cover tool at the next end is taken out, and iron sand in the interlayer is removed;
the step S5 includes: measuring the resistance between the catheter and the outer sleeve by using a universal meter, and observing whether the period is in an open circuit state or not, wherein if the period is in the open circuit state, the bending is qualified;
or the bending part is checked by means of X-ray radiography.
The step S6 includes:
placing the jacket flange body at the central part of the jacket flange lining, and then performing laser welding; and turning the sealing plane after welding for ensuring the sealing flatness and roughness.
Preferably, the step S7 includes:
firstly, sleeving an outer sleeve connecting piece on an outer sleeve of a bent heat-insulating pipe, putting a getter into an interlayer of a semi-finished heat-insulating pipe, welding an inner guide pipe and a jacket flange lining, then, moving the outer sleeve connecting piece to a gap between a flange body and the outer sleeve, welding two ends of the outer sleeve connecting piece, and finally checking the welding seam quality of the outer sleeve connecting piece, the flange body and the outer sleeve through X-ray radiography.
The step S8 includes: interlayer pipeline with jacket flange structureEvacuating to 10 -3 Pa, welding and plugging the vacuum ventilation port, and finally completing the manufacturing of the heat insulation pipe structure.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the traditional stacking foaming heat insulation, the invention has smaller size specification, does not need to manufacture a foaming mould, reduces the cost and the working procedure, and solves the problem that the pipe joint position in the propulsion system is difficult to implement cladding on the device.
2. The inner diameter of the outer sleeve is only 1-3 mm larger than the outer diameter of the inner catheter, so that the integral thickness of the pipeline heat insulation pipe structure is small, and the pipeline heat insulation pipe structure can achieve an elongated shape. Due to the small size specification, the rail attitude control power system can be completely suitable for the compact general assembly layout of the rail attitude control power system.
3. Compared with the traditional vacuum heat-insulating pipe, the heat-insulating pipe can be bent at any angle and space according to the requirements of system layout, namely, one or more bending parts in the vacuum heat-insulating pipe structure can be arranged, so that the effect that the vacuum heat-insulating pipe structure can be bent along with the space trend is achieved.
4. The invention is a continuous pipe at the bending part, has no welding seam, only has welding seams at two ends of the pipeline, greatly reduces the number of welding seams of products, increases the reliability of the products and reduces the cost of the manufacturing process.
5. The inner conduit of the vacuum heat-insulating pipe structure circulates fluid medium hopeful to be insulated from the external environment, a high vacuum state is constructed between the outer sleeve and the inner conduit, and heat exchange formed by air convection between the outer sleeve and the inner conduit is reduced to the greatest extent.
6. The invention adds a heat insulation support between the outer sleeve and the inner conduit to prevent the inner conduit and the outer sleeve from adhering to the bent pipe of the pipe to cause thermal short circuit.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
fig. 1 is a schematic general structure of the present invention.
FIG. 2 is a schematic cross-sectional view of the support insulation material and inner and outer tubes of the present invention.
FIG. 3 is a schematic cross-sectional view of the present invention supporting the placement of insulation within a pipe.
The figure shows:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
The invention provides a vacuum heat insulation pipe structure which has the characteristics of slender structure and suitability for moving to a complex space, and the ratio of the outer diameter to the length of the vacuum heat insulation pipe structure is less than 1:40. As shown in fig. 1-3, the vacuum heat insulation pipe structure is a hard pipe structure and comprises an inner guide pipe 1, an outer sleeve 2, a heat insulation support 3, a jacket flange structure and an outer sleeve connecting piece 6;
the outer sleeve 2 is sleeved outside the inner guide pipe 1, the outer sleeve 2 and the inner guide pipe 1 are provided with one or more bending parts, the bending parts on the inner guide pipe 1 correspond to the bending parts on the outer sleeve 2, and a heat insulation support 3 is arranged between the outer sleeve 2 and the inner guide pipe 1 at the bending parts;
the end of the outer sleeve 2 is connected to the jacket flange structure by the outer sleeve connector 6, and in a preferred embodiment, the outer sleeve connector 6 is of an annular structure and is made of stainless steel.
The end part of the inner conduit 1 is connected with the jacket flange structure; the outer sleeve 2 and/or the jacket flange structure is provided with a vacuum ventilation port 7.
The jacket flange structure comprises a jacket flange body 4 and a jacket flange lining 5, the jacket flange lining 5 is sleeved in the jacket flange body 4, specifically, the end face of the jacket flange body 4 is provided with a sealing face or a sealing groove for connecting and sealing between pipelines, and a concave structure is designed in the middle of the end face of the jacket flange body 4 and used for installing the jacket flange lining 5. The jacket flange lining 5 is arranged in the middle of the flange body 4 and welded with the flange body 4 at the end face of the jacket flange lining 5, the contact part of the flange lining 5 and the flange body 4 is designed to reduce the metal heat conduction thickness to be within 1mm, and the inside of the jacket flange lining 5 is used for circulating fluid for heat insulation.
The jacket flange lining 5 is directly connected with the inner conduit 1, the jacket flange body 4 is connected with the outer sleeve 2 through the outer sleeve connecting piece 6, the outer sleeve connecting piece 6 is used for connecting the jacket flange body 4 and the outer sleeve 2 to enable an interlayer space to be closed and isolated from the external environment, and the length of the outer sleeve connecting piece 6 is within 20 mm.
The outer sleeve 2 and/or the jacket flange body 4 are/is provided with a vacuum ventilation port 7, the vacuum ventilation port 7 is used for controlling the state between the interlayers, and the interlayer is in a vacuum state through the gas extraction of the vacuum ventilation port 7.
The inner guide pipe 1 is a metal slender straight pipe before being manufactured and processed, and the surface of the inner guide pipe is bright. The outer sleeve 2 is a metal straight tube before being manufactured and processed, the inner surface of the outer sleeve is bright, and the inner diameter of the outer sleeve is 1-3 mm greater than the outer diameter of the inner guide tube 1.
The heat insulating support 3 is made of a material with a low heat conductivity coefficient and a high hardness and strength, and in a preferred embodiment, the heat insulating support 3 has a heat conductivity coefficient of less than 0.5W/m·k, and in a preferred embodiment, the heat insulating support 3 is made of a glass fiber material. The heat-insulating support 3 has a certain configuration, in particular, the heat-insulating support 3 is a circular ring structure with cutting parts 31 arranged around, the cutting parts 31 are arranged along the circumference of the circular ring structure, and the heat-insulating support 3 can be understood as a circular ring with a hole in the middle, but some parts are cut out at the periphery of the circular ring structure. The design of the cutting portion 31 can be used to further reduce the heat conduction through the heat insulating support, and can be used to smoothly pass the iron sand through the heat insulating support 3 when manufacturing the vacuum heat insulating pipe structure. The heat insulation support 3 is arranged at the bent part of the vacuum heat insulation pipe structure, namely, the heat insulation support 3 is arranged at the bent parts of the heat insulation pipe, the heat insulation support quantity is arranged at each bent part according to the radian of the bent part, 2 heat insulation supports are arranged at the bent parts within 90 degrees, 3 heat insulation supports are arranged at the bent parts within more than 90 degrees and less than 180 degrees, the heat insulation supports are used for preventing the heat leakage caused by the contact between the inner guide pipe 1 and the outer sleeve 2, and the thickness of the heat insulation supports is smaller than 3mm.
The inner conduit 1 of the vacuum heat insulation pipe structure is communicated with a fluid medium hoped to be insulated from the external environment, a high vacuum state is constructed between the outer sleeve 2 and the inner conduit 1, and heat exchange formed by air convection between the layers is reduced to the greatest extent. In addition, a heat insulating support is added between the outer sleeve 2 and the inner conduit 1, so that the inner conduit 1 and the outer sleeve 2 are prevented from adhering to the bent pipe of the pipe to cause thermal short circuit. The vacuum heat insulation pipe structure of the invention can be bent along with the space trend.
The invention also provides a manufacturing method of the vacuum heat-insulating pipe structure, which is used for manufacturing the vacuum heat-insulating pipe structure and comprises the following steps: s1, measuring the size; s2, sand filling of a jacket; s3, bending the heat insulation pipe; s4, jacket sand removal; s5, bending and checking; s6, welding a jacket flange; s7, welding the flange and the heat insulation pipe; s8, evacuating and sealing the interlayer.
The step S1 includes: according to the length of actual demand bending sample rod and measuring sample rod, selecting corresponding specification metal straight pipe, cleaning and drying, then taking as inner conduit 1 and outer sleeve 2, and according to sample rod length measuring inner conduit 1 length, subtracting two ends respectively by 2-5 mm on the basis of inner conduit length outer sleeve 2 length, specifically, inner conduit length 1m, outer sleeve length 994mm, two ends respectively leave 3mm for welding. And measuring bending or bending positions of the sample rod by using the rope, determining the number and positions of the heat insulation supports 3 according to bending or bending angles, specifically, arranging 2 supports at two sides of the bending or bending position, adopting the principle of 3 supports at more than 90 degrees and less than 180 degrees, and marking the corresponding positions of the inner guide tube support and the outer sleeve support by using the marking pen. The heat insulation support 3 is sleeved into the inner guide pipe 1 and fixed by glue, after the glue is solidified, the inner guide pipe 1 with the heat insulation support 3 is plugged into the outer sleeve 2, 2-5 mm, specifically 3mm, are reserved at two ends of the inner guide pipe, and a semi-finished heat insulation pipe is formed and is of a jacket structure, and at the moment, the heat insulation support 3 and the outer sleeve 2 of the inner guide pipe 1 are in cross-section, as shown in figure 2.
The step S2 comprises the following steps: and fixing the blanking cover frock at one end of the semi-finished thermal insulation pipe, and preventing the fine iron sand added subsequently from leaking out. And (3) erecting the semi-finished heat-insulating pipe by using an iron sand filling tool, and filling sand into an interlayer between the inner guide pipe 1 and the outer sleeve 2, wherein the process must ensure drying. The diameter of the iron sand is 0.1mm, and a tool is used during the process, so that the inner guide pipe 1 is erected and the gap between the inner guide pipe and the outer sleeve pipe 2 is kept uniform. After the iron sand overflows, a tool is used for tapping the outer sleeve 2, so that the inner iron sand interval is more compact, the iron sand can descend at the moment, then the descending position is supplemented with iron sand, the steps are repeated for 2-3 times until the iron sand liquid level does not descend any more, then a blanking cover tool is plugged into the other side of the guide pipe, a semi-finished thermal insulation pipe is blocked, the blanking cover tool is clamped by a clamping tool, and the blanking cover tool is used for blocking the semi-finished thermal insulation pipe.
The step S3 includes: the semi-finished insulated pipe is placed on a bending die and bent to a desired angle at a desired position, in comparison with a desired bent sample bar, at which time the insulation support 3 is in a cross-sectional relationship with the outer sleeve 2 of the inner conduit 1 along the axis, as shown in fig. 3.
The step S4 includes: and after the semi-finished heat-insulating pipe is bent, taking a blanking cover tool at the next end, pouring out all the iron sand, knocking the outer sleeve wall by using a tool while pouring in the pouring process, completely pouring out the iron sand in the jacket, and then blowing out the iron sand in the jacket left and right by using an air gun and the corresponding tool to remove the iron sand in the interlayer.
The step S5 includes: and measuring the resistance between the catheter 1 and the outer sleeve 2 by using tools such as a universal meter, and checking the bent position by using an X-ray shooting mode if the observation period is in an open circuit state, and if the observation period is in the open circuit state, the bending is considered to be qualified.
The step S6 includes: and placing the jacket flange body 4 at the central part of the jacket flange lining 5, and then performing laser welding with the penetration depth of 1mm. The welded jacket flange body 4 and the jacket flange lining 5 form a jacket flange structure, and the welded jacket flange body and the jacket flange lining are deformed due to welding thermal deformation, so that the welded jacket flange body and the jacket flange lining are subjected to machining for 0.1mm for ensuring the sealing flatness and roughness.
The step S7 includes: firstly, the outer sleeve connecting piece 6 is sleeved on the outer sleeve 2 of the heat-insulating pipe which is bent, a small amount of getter such as activated carbon is put into an interlayer of a semi-finished heat-insulating pipe, then the inner guide pipe 1 and the jacket flange lining 5 are welded, after shooting or airtight inspection is carried out on a welding seam, the outer sleeve connecting piece 6 is moved to a gap between the flange body 4 and the outer sleeve 2, two ends of the flange body 4 and the outer sleeve 2 are welded, and finally the welding seam quality of the outer sleeve connecting piece 4, the flange body 4 and the outer sleeve 2 is inspected through X-ray shooting.
The step S8 includes: evacuating the interlayer pipeline (i.e. the semi-finished thermal insulation pipe) after the jacket flange structure is installed to 10 -3 Pa, and completing the welding and plugging of the vacuum ventilation port 7, specifically, placing the interlayer pipeline in an electron beam welding furnace, and evacuating the furnace to 10 -3 And Pa is lower, welding and plugging of the vacuum ventilation port 7 are completed, and finally the manufacturing of the slender heat insulation pipe is completed.
Compared with the traditional stacking foaming heat insulation, the invention has smaller size specification, does not need to manufacture a foaming mould, reduces the cost and the working procedure, and solves the problem that the pipe joint position in the propulsion system is difficult to implement cladding on the device; the invention adopts the form of welding the metal tube, can completely isolate water vapor, and meets the requirement of repeated use of the aircraft for many times. Compared with the traditional stacking heat control, the invention can completely solve the problem that air condensation is caused by cold and hot alternation in the ground test, and the heat insulation performance is easy to lose due to the fact that moisture enters into a heat insulation material; compared with the traditional vacuum heat insulation pipe, the invention has smaller size and small mass, and can completely adapt to the compact general assembly layout of the rail attitude control power system. Compared with the traditional vacuum heat insulation pipe, the long and thin heat insulation pipe can be bent at any angle and space along with the requirement of system layout, is a continuous pipe at the elbow, has no weld, and only has weld at two ends of a pipeline, thereby greatly reducing the number of weld of products, increasing the reliability of the products and reducing the cost of the manufacturing process. Compared with the traditional hose heat insulation structure, the hose has the advantages that the hose has large weight on one hand and is not easy to fix and deform due to the soft property on the other hand because of a large quantity of swing vibration scenes in the aircraft, and the hose mechanical environment is complex, so that the hose heat insulation structure is not suitable for the aircraft, but has light weight, adopts a hard tube structure and is not easy to deform, and can be suitable for the aircraft and other environments.
In summary, the invention provides a slim heat insulation pipeline structure with small specification and size, repeated use, moisture resistance and moisture absorption resistance and a manufacturing method thereof aiming at low-temperature rail attitude control power. The invention is suitable for low-temperature propellant transportation for space aircrafts, in particular for low-temperature propellant transportation of slender pipelines, has better heat control effect on system low-temperature propellant transportation, and has the advantages of simple maintenance, small space size of pipeline section, moisture and moisture resistance and complete reuse compared with the pipeline adopting stacking heat control cladding for low-temperature propellant transportation.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. The vacuum heat insulation pipe structure is characterized by comprising an inner guide pipe (1), an outer sleeve (2), a heat insulation support (3), a jacket flange structure and an outer sleeve connecting piece (6);
the outer sleeve (2) is sleeved on the outer side of the inner catheter (1), the outer sleeve (2) and the inner catheter (1) are provided with one or more bending parts, and an adiabatic support (3) is arranged between the outer sleeve (2) and the inner catheter (1) at the bending parts;
the end part of the outer sleeve (2) is connected with the jacket flange structure through the outer sleeve connecting piece (6), and the end part of the inner conduit (1) is connected with the jacket flange structure; the outer sleeve (2) and/or the jacket flange structure are/is provided with a vacuum ventilation port (7).
2. The vacuum insulated pipe structure of claim 1, wherein the vacuum insulated pipe structure is an elongated insulated pipe, the elongated vacuum insulated pipe structure having an outer diameter to length ratio of less than 1:40;
the outer sleeve (2) is a metal straight pipe before being manufactured and processed, the inner surface of the outer sleeve is bright, and the inner diameter of the outer sleeve is 1-3 mm greater than the outer diameter of the inner guide pipe (1).
3. Vacuum insulation piping structure according to claim 1, characterized in that the jacket flange structure comprises a jacket flange body (4) and a jacket flange lining (5), the jacket flange lining (5) is sleeved inside the jacket flange body (4), the jacket flange lining (5) is directly connected with the inner conduit (1), the jacket flange body (4) is connected with the outer sleeve (2) through the outer sleeve connecting piece (6);
the outer sleeve (2) and/or the jacket flange body (4) are provided with a vacuum ventilation port (7);
the contact part of the flange lining (4) and the flange body (5) is used for reducing metal heat conduction, and the design thickness is within 1 mm;
the end face of the jacket flange body (4) is provided with a sealing face or a sealing groove for connecting and sealing between pipelines, and a concave structure for installing the jacket flange lining (5) is arranged in the middle of the end face of the jacket flange body 4.
4. Vacuum insulated pipe structure according to claim 1, characterized in that the number of said insulated supports (3) is determined according to the bending angle of the bend;
the bending angle of the bending part is within 90 DEG, and the number of the heat insulation supports (3) is 2;
the bending angle of the bending part is more than 90 degrees and less than 180 degrees, and the number of the heat insulation supports (3) is 3.
5. Vacuum insulated pipe structure according to claim 1, characterized in that the material of the insulating support (3) is chosen to have a higher hardness, a lower thermal conductivity; the thickness of the heat insulation support is within 3 mm;
the heat insulation support (31) is of a circular ring structure provided with cutting parts (31), and the cutting parts (31) are arranged along the circumferential direction of the circular ring structure; the cutting part (31) is used for reducing the contact surface area of the heat insulation support (3) and the outer sleeve (2) so as to reduce heat transfer, and is also used for manufacturing a vacuum heat insulation pipe structure, and sand grains can normally enter and exit the jacket structure in the sand filling and pouring step.
6. A vacuum insulated pipe structure according to claim 1, characterized in that the outer sleeve connection (6) is of annular construction and is made of stainless steel.
7. A method of manufacturing a vacuum insulated pipe structure, comprising the steps of:
s1, measuring the size;
s2, sand filling of a jacket;
s3, bending the heat insulation pipe;
s4, jacket sand removal;
s5, bending and checking;
s6, welding a jacket flange;
s7, welding the flange and the heat insulation pipe;
s8, evacuating and sealing the interlayer.
8. The method of manufacturing a vacuum insulated pipe structure according to claim 7, wherein the step S1 comprises: bending a sample rod according to actual requirements, measuring the length of the sample rod, selecting a metal straight pipe with corresponding specification, cleaning and drying the metal straight pipe to serve as an inner guide pipe (1) and an outer sleeve (2), measuring the length of the inner guide pipe (1) according to the length of the sample rod, subtracting 2-5 mm from the length of the outer sleeve (2) on the basis of the length of the inner guide pipe, measuring the bending or bending position of the sample rod by using a measuring rope, determining the number and the position of heat insulation supports (3) according to the bending or bending angle, marking the corresponding positions of the inner guide pipe and the outer sleeve support by using a marking pen, sleeving the heat insulation supports (3) into the inner guide pipe (1), fixing the heat insulation supports by using glue, and plugging the inner guide pipe (1) with the heat insulation supports (3) into the outer sleeve (2) after the glue is solidified, and reserving 2-5 mm from the two ends to form a semi-finished heat insulation pipe which is of a jacket structure;
the step S2 comprises the following steps: fixing a blanking cover tool at one end of a semi-finished heat-insulating pipe, erecting the semi-finished heat-insulating pipe, and filling sand into an interlayer between the inner guide pipe (1) and the outer sleeve (2); after sand filling, a plugging tool is plugged into the other side of the semi-finished product heat-insulating pipe to plug the semi-finished product heat-insulating pipe, the clamping tool is used for clamping the plugging tool, and the plugging tool is used for plugging the semi-finished product heat-insulating pipe;
the step S3 includes: the semi-finished thermal insulation piping is placed on a bending die at a desired position and bent to a desired angle in accordance with the desired bent sample bar.
9. The method of manufacturing a vacuum insulated pipe structure according to claim 8, wherein,
the step S4 includes: after the semi-finished heat-insulating pipe is bent, a blanking cover tool at the next end is taken out, and iron sand in the interlayer is removed;
the step S5 includes: measuring the resistance between the catheter (1) and the outer sleeve (2) by adopting a universal meter, and observing whether the period is in an open circuit state or not, if the period is in the open circuit state, the bending is qualified;
or checking the bending part by means of X-ray film shooting;
the step S6 includes:
placing the jacket flange body (4) at the central part of a jacket flange lining (5), and then performing laser welding; and turning the sealing plane after welding for ensuring the sealing flatness and roughness.
10. The method of manufacturing a vacuum insulated pipe structure according to claim 9, wherein,
the step S7 includes:
firstly, sleeving an outer sleeve connecting piece (6) on an outer sleeve (2) of a bent heat-insulating pipe, putting a getter into an interlayer of a semi-finished heat-insulating pipe, welding an inner guide pipe (1) and a jacket flange lining (5), then, moving the outer sleeve connecting piece (6) to a gap between a flange body (4) and the outer sleeve (2), welding two ends of the flange body (4) and the outer sleeve (2), and finally checking the quality of welding seams of the outer sleeve connecting piece (4) and the flange body (4) and the outer sleeve (2) through X-ray radiography;
the step S8 includes: evacuating the interlayer pipeline after installing the jacket flange structure to 10 -3 Pa, and welding and plugging the vacuum ventilation port (7), and finally completing the manufacturing of the heat insulation pipe structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311630281.4A CN117781089A (en) | 2023-11-30 | 2023-11-30 | Vacuum heat insulation pipe structure and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311630281.4A CN117781089A (en) | 2023-11-30 | 2023-11-30 | Vacuum heat insulation pipe structure and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117781089A true CN117781089A (en) | 2024-03-29 |
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ID=90384273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311630281.4A Pending CN117781089A (en) | 2023-11-30 | 2023-11-30 | Vacuum heat insulation pipe structure and manufacturing method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN117781089A (en) |
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2023
- 2023-11-30 CN CN202311630281.4A patent/CN117781089A/en active Pending
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